Padded camera "inlay" for hiking bag

Up until now I've had M43 gear which basically all fits into a single holster bag. Now I'm after an 'inlay' (for want of a better word) which fits the D810, both lenses, filters and space for another lens in the future, which can fit in a hiking bag. It doesn't need to be waterproof on it's own, and I would like to be able to get to everything inside of it at once.

Have a look on Amazon, just search for "camera bag insert". There are a surprising number of solutions available. I got a one a couple of years ago to take protect my 5DmkIV when I carried it around in a standard messenger type bag, it was cheap and pretty good.